js点击选中文本框内容

<input type="text" id="myInput" value="点击这里选中文本">
<script>
document.getElementById('myInput').addEventListener('click', function() {
    this.select();
});
</script>

<input type="text" id="myInput" value="点击这里选中文本">
<script>
document.getElementById('myInput').addEventListener('click', function() {
    this.setSelectionRange(0, this.value.length);
});
</script>

<input type="text" id="myInput" value="点击这里选中文本">
<script>
document.getElementById('myInput').addEventListener('click', function() {
    if (this.setSelectionRange) {
        this.setSelectionRange(0, this.value.length);
    } else if (this.createTextRange) { // 兼容IE
        var range = this.createTextRange();
        range.collapse(false);
        range.select();
    }
});
</script>