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vue可以通过watch来监听属性值的变化。
这是一个计算人民币对美元汇率的例子
");
window.frames["iframe_show7809"].document.write(decodeHtml($("textarea#stepcodeTextarea7809").val()));
window.frames["iframe_show7809"].document.close();
$(window.frames["iframe_show7809"]).load(function(){
$("#iframe_show7809").height($("#iframe_show7809").contents().find("body").height()+showittryitheight);
});
$("#iframe_show7809").height($("#iframe_show7809").contents().find("body").height()+showittryitheight);
setTimeout(function(){
},500);
});
<script src="http://127.0.0.1/study/vue.min.js"></script>
<style>
table tr td{
border:1px solid gray;
padding:10px;
}
table{
border-collapse:collapse;
width:800px;
table-layout:fixed;
}
tr.firstLine{
background-color: lightGray;
}
</style>
<div id="div1">
<table align="center" >
<tr class="firstLine">
<td>人民币</td>
<td>美元</td>
</tr>
<tr>
<td align="center" colspan="2">
汇率： <input type="number" v-model.number="exchange" />
</td>
</tr>
<tr>
<td align="center">
￥: <input type="number" v-model.number = "rmb" />
</td>
<td align="center">
$: <input type="number" v-model.number = "dollar" />
</td>
</tr>
</table>
</div>
<script>
new Vue({
el: '#div1',
data: {
exchange:6.4,
rmb:0,
dollar:0
},
watch:{
rmb:function(val) {
this.rmb = val;
this.dollar = this.rmb / this.exchange;
},
dollar:function(val) {
this.dollar = val;
this.rmb = this.dollar * this.exchange;
},
}
})
</script>
<script src="http://127.0.0.1/study/vue.min.js"></script>
<style>
table tr td{
border:1px solid gray;
padding:10px;
}
table{
border-collapse:collapse;
width:800px;
table-layout:fixed;
}
tr.firstLine{
background-color: lightGray;
}
</style>
<div id="div1">
<table align="center" >
<tr class="firstLine">
<td>人民币</td>
<td>美元</td>
</tr>
<tr>
<td align="center" colspan="2">
汇率： <input type="number" v-model.number="exchange" />
</td>
</tr>
<tr>
<td align="center">
￥: <input type="number" v-model.number = "rmb" />
</td>
<td align="center">
$: <input type="number" v-model.number = "dollar" />
</td>
</tr>
</table>
</div>
<script>
new Vue({
el: '#div1',
data: {
exchange:6.4,
rmb:0,
dollar:0
},
watch:{
rmb:function(val) {
this.rmb = val;
this.dollar = this.rmb / this.exchange;
},
dollar:function(val) {
this.dollar = val;
this.rmb = this.dollar * this.exchange;
},
}
})
</script>
");
window.frames["iframe7809"].document.write(decodeHtml(code7809));
window.frames["iframe7809"].document.close();
//load和下面的非load必需并存，因为如果代码用到了jquery就必须使用load的方式
$(window.frames["iframe7809"]).load(function(){
$("#iframe7809").height($("#iframe7809").contents().find("body").height()+showittryitheight);
});
$("#iframe7809").height($("#iframe7809").contents().find("body").height()+showittryitheight);
alreadyWriteCode7809 = code7809;
$("#rendering7809").hide();
$("#rendered7809").show();
}
var tRereshRetry2DemoPanel7809 = setInterval(rereshRetry2DemoPanel7809,1000);
var binded7809 = false;
$("textarea#stepcodeTextarea7809").keyup(function(){
if(!binded7809){
$(window).bind('beforeunload',function(){
binded7809 = true;
return "xxxx";
});
}
var newCode = $(this).val()
code7809 = newCode;
/*below code is replaced by function rereshRetry2DemoPanel()*/
// if(code7809!=newCode){
// window.frames["iframe7809"].document.write("
");
// window.frames["iframe7809"].document.write(decodeHtml($("textarea#stepcodeTextarea7809").val()));
// window.frames["iframe7809"].document.close();
// $(window.frames["iframe7809"]).load(function(){
// $("#iframe7809").height($("#iframe7809").contents().find("body").height()+showittryitheight);
// });
// code7809 = newCode;
// }
});
$(".tryButton7809").click(function(){
$("#tryDiv7809").show();
$("#stepcodeTextarea7809").focus();
$("#stepcodeTextarea7809").height(200);
$("#iframe7809").height(0);
window.frames["iframe7809"].document.write("
");
window.frames["iframe7809"].document.write(decodeHtml($("textarea#stepcodeTextarea7809").val()));
window.frames["iframe7809"].document.close();
//load和下面的非load必需并存，因为如果代码用到了jquery就必须使用load的方式
$(window.frames["iframe7809"]).load(function(){
$("#iframe7809").height($("#iframe7809").contents().find("body").height()+showittryitheight);
});
$("#iframe7809").height($("#iframe7809").contents().find("body").height()+showittryitheight);
this.scrollIntoView(true);
editor7809.focus();
editor7809.setSize(null, "250");
$("#rendering7809").hide();
$("#rendered7809").hide();
});
var mixedMode = {
name: "htmlmixed",
scriptTypes: [{matches: /\/x-handlebars-template|\/x-mustache/i,
mode: null},
{matches: /(text|application)\/(x-)?vb(a|script)/i,
mode: "vbscript"}]
};
var editor7809 = CodeMirror.fromTextArea(document.getElementById("stepcodeTextarea7809"), {
lineNumbers: true,
styleActiveLine: true,
matchBrackets: true,
mode:"text/html",
theme:"eclipse",
selectionPointer: true,
lineWrapping: true,
extraKeys: {
"Alt-/": "autocomplete",
"Ctrl-F": "findPersistent",
"F8": function(cm) {
cm.setOption("fullScreen", !cm.getOption("fullScreen"));
},
"Esc": function(cm) {
if (cm.getOption("fullScreen")) cm.setOption("fullScreen", false);
}
}
});
editor7809.on("change",function(doc){
if(!binded7809){
$(window).bind('beforeunload',function(){
binded7809 = true;
return "xxxx";
});
}
var newCode = doc.getValue();
code7809 = newCode;
$("textarea#stepcodeTextarea7809").val(newCode);
if(alreadyWriteCode7809!=code7809){
lastModifedTime7809 = new Date().getTime();
$("#rendering7809").show();
$("#rendered7809").hide();
}
// alert(doc.getValue());
});
$(".CodeMirror").addClass("form-control");
// var editor7809 = CodeMirror.fromTextArea(, {
// lineNumbers: true,
// styleActiveLine: true,
// matchBrackets: true,
// theme:"eclipse",
// });
editor7809.on("change",function(doc){
// alert(doc.getValue());
});
$("#tryDiv7809").hide();
});
$("div.codemirrorTips span").addClass("glyphicon glyphicon-asterisk");
1. 双击选中单词
2. 三击选中整行
3. CTRL+F 查找
4. F8 全屏编辑，再次点击恢复
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渲染中
渲染完成
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代码高亮插件双击即可选中，不过部分同学反应，通过代码高亮插件复制的代码无法在IDEA里正常显示，这里提供TEXTAREA的方式，方便复制，谢谢
1. 自行完成练习
根据练习目标尽量自己实现代码效果，期间会碰到疑问，难题，和自己不懂的地方，这些都是必要的过程
2. 带着疑问查看答案
完成过程中，碰到无法解决的问题，带着疑问，查看答案，分析答案的解决思路
3. 查看答案讲解视频
依然有不明白的地方，点开视频讲解，带着疑问，听视频讲解有问题的部分
4. 再做一遍
理解后，再从头做一遍，把有疑问的地方都捋清楚
5. 总结
最后再总结一遍，总结思路，总结解决办法，以后遇到类似的问题，怎么处理
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