5个JavaScript小技巧

js监听input值发生变化

$("#inputval").bind('input propertychange',function(e){    console.log($(this).val())
})

js截取某个字符串前面的内容

var str = "aaabbbcccdddeeefff";
str = str.match(/aaa(\S*)fff/)[1];
alert(str);//结果bbbcccdddeeevar str = "aaabbbcccdddeeefff";
str = str.match(/(\S*)fff/)[1];
alert(str);//结果aaabbbcccdddvar str = "aaabbbcccdddeeefff";
str = str.match(/aaa(\S*)/)[1];
alert(str);//结果bbbcccdddeeefff

js屏蔽微信右上角分享按钮

 document.addEventListener(‘WeixinJSBridgeReady‘, function onBridgeReady() {     // é€šè¿‡ä¸‹é¢è¿™ä¸ªAPI隐藏底部导航栏
     WeixinJSBridge.call(‘hideToolbar‘);
 });            
 document.addEventListener(‘WeixinJSBridgeReady‘, function onBridgeReady() {     // é€šè¿‡ä¸‹é¢è¿™ä¸ªAPI显示底部导航栏
     WeixinJSBridge.call(‘showToolbar‘);
 });

js获取div里面的内容

    è¿™æ˜¯å†…容
var a=document.getElementById("id1").innerText;

js验证表达是否为空

" title="" data-original-title="复制" style="box-sizing: border-box; appearance: button; cursor: pointer; display: block; float: left; background-image: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB3aWR0aD0iNjQiIGhlaWdodD0iMTYiPjxkZWZzPjxwYXRoIGlkPSJhIiBkPSJNMCAwaDE2djE2SDB6Ii8+PG1hc2sgaWQ9ImIiIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiIgeD0iMCIgeT0iMCIgZmlsbD0iI2ZmZiIgbWFza0NvbnRlbnRVbml0cz0idXNlclNwYWNlT25Vc2UiIG1hc2tVbml0cz0ib2JqZWN0Qm91bmRpbmdCb3giPjx1c2UgeGxpbms6aHJlZj0iI2EiLz48L21hc2s+PC9kZWZzPjxnIGZpbGw9Im5vbmUiIGZpbGwtcnVsZT0iZXZlbm9kZCI+PHBhdGggZmlsbD0iI0ZGRiIgZD0iTTM0IDJ2MTNoMTF2MUgzM1YyaDF6bTktMnY1aDR2OUgzNVYwaDh6bS0yIDZoLTF2MmgtMnYxaDJ2MmgxVjloMlY4aC0yVjZ6bTMtNmwzIDRoLTNWMHpNMzEgM3YxM0gyMFYzaDExem0tMy0zdjJoLTFWMWgtOXYxMmgxdjFoLTJWMGgxMXptLTEgMTJoLTV2MWg1di0xem0xLTJoLTZ2MWg2di0xem0wLTJoLTZ2MWg2Vjh6bTEtMmgtN3YxaDdWNnoiLz48dXNlIHN0cm9rZT0iI0ZGRiIgc3Ryb2tlLWRhc2hhcnJheT0iMSIgc3Ryb2tlLXdpZHRoPSIyIiBtYXNrPSJ1cmwoI2IpIiB4bGluazpocmVmPSIjYSIvPjxwYXRoIGZpbGw9IiNGRkYiIGQ9Ik03IDl2NEgzVjloNHptNiAwdjRIOVY5aDR6TTcgM3Y0SDNWM2g0em02IDB2NEg5VjNoNHptNTEtM3YxNmgtM3YtMWgyVjFoLTJWMGgzek01MSAwdjFoLTJ2MTRoMnYxaC0zVjBoM3ptMTAgM3YxMEg1MVYzaDEwem0tMiA3aC00djFoNHYtMXptLTEtMmgtNXYxaDVWOHptMS0yaC00djFoNFY2em0tMS0yaC01djFoNVY0eiIvPjwvZz48L3N2Zz4="); height: 16px; width: 16px; background-size: auto 16px; margin: 4px 5px; opacity: 0.5; background-position: -16px 0px !important;">

     

    

        
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