JavaScript开发技巧
分类:
IT文章
•
2022-04-16 22:09:29
1.在编写js代码时，应尽量避免全局变量的使用。如果实在需要使用全局变量，则可以使用一个function来规避全局变量的使用。
2.数字解析
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1 //1.丢弃小数部分,保留整数部分
2 alert( parseInt(7/2) + ":3" );
3
4
5 //2.向上取整,有小数就整数部分加1
6 alert( Math.ceil(7/2) +":4" );
7
8
9 // 3,四舍五入.
10 alert( Math.round(7/2) + ":4");
11
12
13 // 4,向下取整
14 alert( Math.floor(7/2) +":4");
数字解析
3.encodeURI的妙用(encodeURI非中文编码 不起作用的)
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1 function test(varcode){
2 var code = varcode?varcode:"中国";
3 var encode = encodeURI(code);
4 var enencode = encodeURI(encode);
5 alert(" encode="+encode+"
"+"enencode="+enencode+"
xxxx="+encodeURI(encodeURI(code)));
6 }
7 test("sdsds2323232");
encode
4.页面宽高自适应
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1 /*window resize*/
2 winResize=function(){
3 var winWidth = $(document.body).width(),winHeight=$(document.body).height();
4 $("#js_layout").layout("resize",{winWidth,height:winHeight});
5 $("#tree_penal2").css({winWidth-10,height:winHeight-62});
6 };
7 $(window).resize(winResize);
8 winResize();
$(window).resize()
5.对象数组，组装URL
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1 queryParams.titleName = $("#titleNameSearch").val()
2 queryParams.createUserRealName = "";
3 queryParams.typeId = $("#typeIdSearch").val();
4 queryParams.beginDate =$("#beginDateSearch").val();
5 queryParams.endDate = $("#endDateSearch").val();
6 queryParams.wbCode =$("#wbCodeSearch").val();
7 queryParams.phaseId = $("#phaseIdSearch").val();
8 queryParams.subjectId =$("#wbsTitleIdSearch").val();
9 //queryParams.newDate = new Date();
10 queryParams.pSelect=pSelect;
11 queryParams.ctype=$("#ctypeSearch").val();
12 scopeparam=queryParams;
13 var qparamUrl="";
14 for(var a in queryParams){
15 qparamUrl+="&"+a+"="+encodeURIComponent(queryParams[a]);
16 }
for循环+encodeURIComponent实现对象数组URL参数化
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1 var title = "${param.title}";
2 var queryParams = {
3 pSelect:"${param.pSelect}",
4 titleName:"${param.titleName}",
5 typeId:"${param.typeId}",
6 wbCode:"${param.wbCode}",
7 phaseId:"${param.phaseId}",
8 subjectId:"${param.subjectId}",
9 beginDate:"${param.beginDate}",
10 endDate:"${param.endDate}"
11 };
