ejs v9 javascript模板系统
人气:0
本版本就是改回v6的形态，后端数据还是带@前端才方便查看与调试。昨天也与一TX前端工程师讨论过这个必要性。取得模板中的需要填写的变量，再与后端传过来的JSON进行比较，尽早进行数据验证。这种技术，可以看一看PHP的变量命名就知了，带是带$前缀。
在之前的版本中，如果输出语句带分号或逗号是会报错的
<script type="tmpl" id="table_tmpl">
<table>
<& for(var i=0,tl = @trs.length,tr;i<tl;i++){ &>
<& tr = @trs[i]; &>
<tr>
<td><&= tr.name; &></td> <td><&= tr.age; &></td> <td><&= tr.sex || "男" &></td>
</tr>
<& } &>
</table>
<&# 怎么可能不支持图片 &>
<img src="<&= @href &>">
</script>
因为内部生成的字符串是这个样子的:
__views(data.tr.name;)
为了防止用户顺手把个逗号或分号上去,本版本自动帮你处理了.
rlastSemi = /[,;]\s*$/
// 略
case "="://处理后台返回的变量（输出到页面的);
logic = els[0].substring(1);
if(logic.indexOf("@")!==-1){
temp.push( startOfHTML, logic.replace(rAt,"$1data.").replace(rlastSemi,''), endOfHTML );
}else{
temp.push( startOfHTML, logic.replace(rlastSemi,''), endOfHTML );
}
break;
例子
下面是一个模板，放置于浏览器会忽略解析JS代码的script标签之内， 注意trs与href前面都带有@标识符。
<script type="tmpl" id="table_tmpl">
<table>
<& for(var i=0,tl = @trs.length,tr;i<tl;i++){ &>
<& tr = @trs[i]; &>
<tr>
<td><&= tr.name &></td> <td><&= tr.age &></td> <td><&= tr.sex || "男" &></td>
<&# 导入子模板 &>
<&= $.ejs("tds_tmpl"); &>
</tr>
<& } &>
</table>
<&# 怎么可能不支持图片 &>
<img src="<&= @href &>">
</script>
<!-- 这是子模板 -->
<script type="tmpl" id="tds_tmpl">
<td>静态的表格<https://img.qb5200.com/download-x/d> <td>静态的表格<https://img.qb5200.com/download-x/d> <td>静态的表格<https://img.qb5200.com/download-x/d>
</script>
这是它的JS代码：
$.require("ready,more/ejs,node", function(){
var trs = [
{name:"隐形杀手",age:29,sex:"男"},
{name:"索拉",age:22,sex:"男"},
{name:"fesyo",age:23,sex:"女"},
{name:"恋妖壶",age:18,sex:"男"},
{name:"竜崎",age:25,sex:"男"},
{name:"你不懂的",age:30,sex:"女"}
]
var html = $.ejs("table_tmpl",{
trs: trs,
href: "//www.qb5200.com//rubylouvre/202906/o_type4.jpg"
});
$("#table_tc").html(html)
});
ejs源代码
$.define("ejs", "lang",function(){
var
_startOfHTML = "\t__views.push(",
_endOfHTML = ");\n",
sRight = "&>",
rLeft = /\s*<&\s*/,
rRight = /\s*&>\s*/,
rAt = /(^|[^\w\u00c0-\uFFFF_])(@)(?=\w)/g,
rLastSemi = /[,;]\s*$/
var ejs2 = $.ejs = function(id,data){
data = data || {};
if( !ejs2[id] ){
var rleft = rLeft,
rright = rRight,
sright = sRight,
rlastSemi = rLastSemi,
startOfHTML = _startOfHTML,
endOfHTML = _endOfHTML, str , logic,
el = document.getElementById(id);
if (!el) throw "can not find the target element";
str = el.innerHTML;
var arr = str.trim().split(rleft),
buff = ["var __views = [];\n"],temp = [],i = 0,n = arr.length,els,segment;
while(i < n){//逐行分析，以防歧义
segment = arr[i++];
els = segment.split(rright);
if( ~segment.indexOf(sright) ){//这里不使用els.length === 2是为了避开IE的split bug
switch ( els[0].charAt(0) ) {
case "="://处理后台返回的变量（输出到页面的);
logic = els[0].substring(1);
if(logic.indexOf("@")!==-1){
temp.push( startOfHTML, logic.replace(rAt,"$1data.").replace(rlastSemi,''), endOfHTML );
}else{
temp.push( startOfHTML, logic.replace(rlastSemi,''), endOfHTML );
}
break;
case "#"://处理注释
break;
default://处理逻辑
logic = els[0];
if(logic.indexOf("@")!==-1){
temp.push( logic.replace(rAt,"$1data."), "\n" );
}else{
temp.push( logic, "\n" );
}
}
//处理静态HTML片断
els[1] && temp.push(startOfHTML, $.quote( els[1] ), endOfHTML)
}else{
//处理静态HTML片断
temp.push(startOfHTML, $.quote( els[0] ), endOfHTML );
}
}
ejs2[id] = new Function("data",buff.concat(temp).join("")+';return __views.join("");');
return ejs2[id]( data )
}
return ejs2[id]( data )
}
})
// ejs v9!
在之前的版本中，如果输出语句带分号或逗号是会报错的
复制代码 代码如下:
<script type="tmpl" id="table_tmpl">
<table>
<& for(var i=0,tl = @trs.length,tr;i<tl;i++){ &>
<& tr = @trs[i]; &>
<tr>
<td><&= tr.name; &></td> <td><&= tr.age; &></td> <td><&= tr.sex || "男" &></td>
</tr>
<& } &>
</table>
<&# 怎么可能不支持图片 &>
<img src="<&= @href &>">
</script>
因为内部生成的字符串是这个样子的:
__views(data.tr.name;)
为了防止用户顺手把个逗号或分号上去,本版本自动帮你处理了.
复制代码 代码如下:
rlastSemi = /[,;]\s*$/
// 略
case "="://处理后台返回的变量（输出到页面的);
logic = els[0].substring(1);
if(logic.indexOf("@")!==-1){
temp.push( startOfHTML, logic.replace(rAt,"$1data.").replace(rlastSemi,''), endOfHTML );
}else{
temp.push( startOfHTML, logic.replace(rlastSemi,''), endOfHTML );
}
break;
例子
下面是一个模板，放置于浏览器会忽略解析JS代码的script标签之内， 注意trs与href前面都带有@标识符。
复制代码 代码如下:
<script type="tmpl" id="table_tmpl">
<table>
<& for(var i=0,tl = @trs.length,tr;i<tl;i++){ &>
<& tr = @trs[i]; &>
<tr>
<td><&= tr.name &></td> <td><&= tr.age &></td> <td><&= tr.sex || "男" &></td>
<&# 导入子模板 &>
<&= $.ejs("tds_tmpl"); &>
</tr>
<& } &>
</table>
<&# 怎么可能不支持图片 &>
<img src="<&= @href &>">
</script>
<!-- 这是子模板 -->
<script type="tmpl" id="tds_tmpl">
<td>静态的表格<https://img.qb5200.com/download-x/d> <td>静态的表格<https://img.qb5200.com/download-x/d> <td>静态的表格<https://img.qb5200.com/download-x/d>
</script>
这是它的JS代码：
复制代码 代码如下:
$.require("ready,more/ejs,node", function(){
var trs = [
{name:"隐形杀手",age:29,sex:"男"},
{name:"索拉",age:22,sex:"男"},
{name:"fesyo",age:23,sex:"女"},
{name:"恋妖壶",age:18,sex:"男"},
{name:"竜崎",age:25,sex:"男"},
{name:"你不懂的",age:30,sex:"女"}
]
var html = $.ejs("table_tmpl",{
trs: trs,
href: "//www.qb5200.com//rubylouvre/202906/o_type4.jpg"
});
$("#table_tc").html(html)
});
ejs源代码
复制代码 代码如下:
$.define("ejs", "lang",function(){
var
_startOfHTML = "\t__views.push(",
_endOfHTML = ");\n",
sRight = "&>",
rLeft = /\s*<&\s*/,
rRight = /\s*&>\s*/,
rAt = /(^|[^\w\u00c0-\uFFFF_])(@)(?=\w)/g,
rLastSemi = /[,;]\s*$/
var ejs2 = $.ejs = function(id,data){
data = data || {};
if( !ejs2[id] ){
var rleft = rLeft,
rright = rRight,
sright = sRight,
rlastSemi = rLastSemi,
startOfHTML = _startOfHTML,
endOfHTML = _endOfHTML, str , logic,
el = document.getElementById(id);
if (!el) throw "can not find the target element";
str = el.innerHTML;
var arr = str.trim().split(rleft),
buff = ["var __views = [];\n"],temp = [],i = 0,n = arr.length,els,segment;
while(i < n){//逐行分析，以防歧义
segment = arr[i++];
els = segment.split(rright);
if( ~segment.indexOf(sright) ){//这里不使用els.length === 2是为了避开IE的split bug
switch ( els[0].charAt(0) ) {
case "="://处理后台返回的变量（输出到页面的);
logic = els[0].substring(1);
if(logic.indexOf("@")!==-1){
temp.push( startOfHTML, logic.replace(rAt,"$1data.").replace(rlastSemi,''), endOfHTML );
}else{
temp.push( startOfHTML, logic.replace(rlastSemi,''), endOfHTML );
}
break;
case "#"://处理注释
break;
default://处理逻辑
logic = els[0];
if(logic.indexOf("@")!==-1){
temp.push( logic.replace(rAt,"$1data."), "\n" );
}else{
temp.push( logic, "\n" );
}
}
//处理静态HTML片断
els[1] && temp.push(startOfHTML, $.quote( els[1] ), endOfHTML)
}else{
//处理静态HTML片断
temp.push(startOfHTML, $.quote( els[0] ), endOfHTML );
}
}
ejs2[id] = new Function("data",buff.concat(temp).join("")+';return __views.join("");');
return ejs2[id]( data )
}
return ejs2[id]( data )
}
})
// ejs v9!
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